fix(camera): focus the local player on viewport init (#620)

Thanks!

d2core/d2map/d2maprenderer/renderer.go

@@ -32,7 +32,7 @@ type MapRenderer struct {
 }
 
 // CreateMapRenderer creates a new MapRenderer, sets the required fields and returns a pointer to it.
-func CreateMapRenderer(renderer d2interface.Renderer, mapEngine *d2mapengine.MapEngine, term d2interface.Terminal) *MapRenderer {
+func CreateMapRenderer(renderer d2interface.Renderer, mapEngine *d2mapengine.MapEngine, term d2interface.Terminal, startX, startY float64) *MapRenderer {
 	result := &MapRenderer{
 		renderer:  renderer,
 		mapEngine: mapEngine,
@@ -40,7 +40,8 @@ func CreateMapRenderer(renderer d2interface.Renderer, mapEngine *d2mapengine.Map
 	}
 
 	result.Camera = Camera{}
-	startPosition := d2vector.NewPosition(0, 0)
+	rx, ry := result.WorldToOrtho(startX, startY)
+	startPosition := d2vector.NewPosition(rx, ry)
 	result.Camera.position = &startPosition
 	result.viewport.SetCamera(&result.Camera)
 

d2game/d2gamescreen/game.go

@@ -51,13 +51,24 @@ func CreateGame(
 	gameClient *d2client.GameClient,
 	term d2interface.Terminal,
 ) *Game {
+	// find the local player and its initial location
+	var startX, startY float64
+	for _, player := range gameClient.Players {
+		if player.ID != gameClient.PlayerID {
+			continue
+		}
+		worldPosition := player.Position.World()
+		startX, startY = worldPosition.X(), worldPosition.Y()
+		break
+	}
+
 	result := &Game{
 		gameClient:           gameClient,
 		gameControls:         nil,
 		localPlayer:          nil,
 		lastRegionType:       d2enum.RegionNone,
 		ticksSinceLevelCheck: 0,
-		mapRenderer:          d2maprenderer.CreateMapRenderer(renderer, gameClient.MapEngine, term),
+		mapRenderer:          d2maprenderer.CreateMapRenderer(renderer, gameClient.MapEngine, term, startX, startY),
 		escapeMenu:           NewEscapeMenu(navigator, renderer, audioProvider),
 		inputManager:         inputManager,
 		audioProvider:        audioProvider,

d2game/d2gamescreen/map_engine_testing.go

@@ -186,7 +186,7 @@ func (met *MapEngineTest) OnLoad(loading d2screen.LoadingState) {
 
 	loading.Progress(fiftyPercent)
 
-	met.mapRenderer = d2maprenderer.CreateMapRenderer(met.renderer, met.mapEngine, met.terminal)
+	met.mapRenderer = d2maprenderer.CreateMapRenderer(met.renderer, met.mapEngine, met.terminal, 0.0, 0.0)
 
 	loading.Progress(seventyPercent)
 	met.loadRegionByIndex(met.currentRegion, met.levelPreset, met.fileIndex)